If your left with a day-old challah, you should turn it into croutons. Challah is a great bread for croutons because it easily absorbs seasoning and can toast in the oven on low heat for a while. I made mine with Za'atar, but I encourage you guys to get creative and try whatever comes to your mind.
And what can you do with these croutons? First- snack them as is! They are so yum and crunchy! You can also add them to a soup or a bomb Caesar salad.